| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | /* |
| 3 | * machine_kexec.c - handle transition of Linux booting another kernel |
| 4 | */ |
| 5 | #include <linux/compiler.h> |
| 6 | #include <linux/kexec.h> |
| 7 | #include <linux/mm.h> |
| 8 | #include <linux/delay.h> |
| 9 | #include <linux/reboot.h> |
| 10 | |
| 11 | #include <asm/cacheflush.h> |
| 12 | #include <asm/page.h> |
| 13 | #include <asm/setup.h> |
| 14 | |
| 15 | extern const unsigned char relocate_new_kernel[]; |
| 16 | extern const size_t relocate_new_kernel_size; |
| 17 | |
| 18 | int machine_kexec_prepare(struct kimage *kimage) |
| 19 | { |
| 20 | return 0; |
| 21 | } |
| 22 | |
| 23 | void machine_kexec_cleanup(struct kimage *kimage) |
| 24 | { |
| 25 | } |
| 26 | |
| 27 | void machine_shutdown(void) |
| 28 | { |
| 29 | } |
| 30 | |
| 31 | void machine_crash_shutdown(struct pt_regs *regs) |
| 32 | { |
| 33 | } |
| 34 | |
| 35 | typedef void (*relocate_kernel_t)(unsigned long ptr, |
| 36 | unsigned long start, |
| 37 | unsigned long cpu_mmu_flags) __noreturn; |
| 38 | |
| 39 | void machine_kexec(struct kimage *image) |
| 40 | { |
| 41 | void *reboot_code_buffer; |
| 42 | unsigned long cpu_mmu_flags; |
| 43 | |
| 44 | reboot_code_buffer = page_address(image->control_code_page); |
| 45 | |
| 46 | memcpy(reboot_code_buffer, relocate_new_kernel, |
| 47 | relocate_new_kernel_size); |
| 48 | |
| 49 | /* |
| 50 | * we do not want to be bothered. |
| 51 | */ |
| 52 | local_irq_disable(); |
| 53 | |
| 54 | pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start); |
| 55 | __flush_cache_all(); |
| 56 | cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8; |
| 57 | ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK, |
| 58 | image->start, |
| 59 | cpu_mmu_flags); |
| 60 | } |
| 61 |